diff --git a/store/drizzle/0000_wakeful_zodiak.sql b/store/drizzle/0000_steep_bromley.sql
similarity index 94%
rename from store/drizzle/0000_wakeful_zodiak.sql
rename to store/drizzle/0000_steep_bromley.sql
index bc250b5..e7f3917 100644
--- a/store/drizzle/0000_wakeful_zodiak.sql
+++ b/store/drizzle/0000_steep_bromley.sql
@@ -12,7 +12,8 @@ CREATE TABLE "nodes" (
 	"content" "bytea" NOT NULL,
 	"definition" json NOT NULL,
 	"hash" varchar(8) NOT NULL,
-	"previous" varchar(8)
+	"previous" varchar(8),
+	CONSTRAINT "nodes_hash_unique" UNIQUE("hash")
 );
 --> statement-breakpoint
 ALTER TABLE "nodes" ADD CONSTRAINT "nodes_userId_users_name_fk" FOREIGN KEY ("userId") REFERENCES "public"."users"("name") ON DELETE no action ON UPDATE no action;--> statement-breakpoint
diff --git a/store/drizzle/meta/0000_snapshot.json b/store/drizzle/meta/0000_snapshot.json
index 36c2451..073363e 100644
--- a/store/drizzle/meta/0000_snapshot.json
+++ b/store/drizzle/meta/0000_snapshot.json
@@ -1,5 +1,5 @@
 {
-  "id": "e0d14457-de6a-4832-80fd-ee24523ff95c",
+  "id": "b5fc8bcf-82d4-4d2e-bcd1-89d5a238f5e2",
   "prevId": "00000000-0000-0000-0000-000000000000",
   "version": "7",
   "dialect": "postgresql",
@@ -182,7 +182,15 @@
         }
       },
       "compositePrimaryKeys": {},
-      "uniqueConstraints": {},
+      "uniqueConstraints": {
+        "nodes_hash_unique": {
+          "name": "nodes_hash_unique",
+          "nullsNotDistinct": false,
+          "columns": [
+            "hash"
+          ]
+        }
+      },
       "policies": {},
       "checkConstraints": {},
       "isRLSEnabled": false
diff --git a/store/drizzle/meta/_journal.json b/store/drizzle/meta/_journal.json
index 20760b7..9f2f80a 100644
--- a/store/drizzle/meta/_journal.json
+++ b/store/drizzle/meta/_journal.json
@@ -5,8 +5,8 @@
     {
       "idx": 0,
       "version": "7",
-      "when": 1734695191817,
-      "tag": "0000_wakeful_zodiak",
+      "when": 1734695353420,
+      "tag": "0000_steep_bromley",
       "breakpoints": true
     }
   ]
diff --git a/store/src/routes/node/node.schema.ts b/store/src/routes/node/node.schema.ts
index cd5fdc8..02ee6ea 100644
--- a/store/src/routes/node/node.schema.ts
+++ b/store/src/routes/node/node.schema.ts
@@ -27,7 +27,7 @@ export const nodeTable = pgTable("nodes", {
   nodeId: varchar().notNull(),
   content: bytea().notNull(),
   definition: json().notNull(),
-  hash: varchar({ length: 8 }).notNull(),
+  hash: varchar({ length: 8 }).notNull().unique(),
   previous: varchar({ length: 8 }),
 }, (table) => [
   foreignKey({